did you happen to notice that this board is listed directly under the divorce boards?
no lectures, but 17 is really young to know what you want to do for the rest of your life.
you must be 18 years of age to marry in the state of texas. the cost is $31 (approximate, it may differ by counties or districts). there is a 72 hour waiting period after you obtain your license. the license is valid for 30 days (got get married before then or they are no good). no blood tests are required.
if your mother is willing to sign for the marriage you are okay.
you can obtain a marriage license for any county courthouse. they should have the parental slips there to.

you are old enough to make your own decisions on what you want to do with you life, but you need your mom's permission to act on them. something doesn't seem right there.
